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Bug 78550 - aes encryption option is not available
Summary: aes encryption option is not available
Status: CLOSED DUPLICATE of bug 56698
Alias: None
Product: Red Hat Linux
Classification: Retired
Component: util-linux
Version: 8.0
Hardware: i686
OS: Linux
Target Milestone: ---
Assignee: Elliot Lee
QA Contact: Ben Levenson
Depends On:
TreeView+ depends on / blocked
Reported: 2002-11-25 17:47 UTC by Michael Lee Yohe
Modified: 2007-04-18 16:48 UTC (History)
1 user (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2002-12-07 14:28:34 UTC

Attachments (Terms of Use)

Description Michael Lee Yohe 2002-11-25 17:47:11 UTC
From Bugzilla Helper:
User-Agent: Mozilla/5.0 Galeon/1.2.6 (X11; Linux i686; U;) Gecko/20020830

Description of problem:
When discussing loopback encryption with Arjan, he said that instead of having
to use DES, I could use AES instead (since it is bundled with Red Hat Linux) -
losetup does not recognize "aes" as an available encryption option.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. # losetup -e aes /dev/loop0 test.img 

Actual Results:  Unsupported encryption type aes

Expected Results:  Should allow user to setup an aes encrypted loopback device.

Additional info:

$ rpm -q losetup

Comment 1 Michael Lee Yohe 2002-11-25 17:54:06 UTC
Further, I force injected the "cipher-aes" module:

# modprobe cipher-aes
# losetup -e aes /dev/loop0 /home/myohe/test.img 
Unsupported encryption type aes
# losetup -e cipher-aes /dev/loop0 /home/myohe/test.img 
Unsupported encryption type cipher-aes
# losetup -e AES /dev/loop0 /home/myohe/test.img 
Unsupported encryption type AES

Comment 2 Michael Lee Yohe 2002-11-25 17:56:39 UTC
I should finish my thoughts before hitting "submit.."

# dmesg | grep cryptoapi
cryptoapi: loaded
cryptoapi: Registered aes-ecb (0)
cryptoapi: Registered aes-cbc (65536)
cryptoapi: Registered aes-cfb (131072)
cryptoapi: Registered aes-ctr (262144)
cryptoapi: Registered aes-rtc (524288)

# losetup -e aes-rtc /dev/loop0 /home/myohe/test.img 
Unsupported encryption type aes-rtc
# losetup -e aes-ecb /dev/loop0 /home/myohe/test.img 
Unsupported encryption type aes-ecb
# losetup -e aes-cfb /dev/loop0 /home/myohe/test.img 
Unsupported encryption type aes-cfb
# losetup -e aes-ctr /dev/loop0 /home/myohe/test.img 
Unsupported encryption type aes-ctr
# losetup -e aes-cbc /dev/loop0 /home/myohe/test.img 
Unsupported encryption type aes-cbc

Comment 3 Need Real Name 2002-12-05 08:45:04 UTC
And while it's open (along the same lines); 
how come it only supports XOR which is slow and DES which doesn't work anyway:

losetup -e des /dev/loop0 /file
Init (up to 16 hex digits):
ioctl: LOOP_SET_STATUS: Invalid argument

Lets take DES out as everyone agrees it is too weak and doesn't work anyway, 
and lets put at least one decent one in by default; AES, IDEA or something, and 
even better would be to be able to use loadable encryption modules.

Comment 4 Michael Lee Yohe 2002-12-05 15:01:26 UTC
The DES problem is related to Bug 56698 and includes a semi-howto on what to do
to get encrypted filesystems to work under Red Hat Linux (albeit a non-packaged

I filed Bug 78544 against the kernel - Arjan correctly informed me that the
_kernel_ has loopback encryption support.  However, the Red Hat Linux
distribution itself _does not_ have the support.  I will modify Bug 78544
accordingly to reference the distribution's lack of a method EVEN when the man
pages (documentation) say otherwise.

Comment 5 Need Real Name 2002-12-05 21:30:40 UTC
Does this mean I can just get the src.rpm to losetup and util-linux packages 
and add to the .spec file the patches from 
http://www.kernel.org/pub/linux/kernel/crypto/v2.4/ and expect it to work?

If I understand the problem correctly, and it is so, then I am happy to put 
together and updated src.rpm for rawhide and/or redhat update.

[Yes, and I meant XOR was fast, not slow]

Comment 6 Need Real Name 2002-12-07 14:28:28 UTC
Well.... I derived the patch for the util-linux package but it doesn't apply 
cleanly when combined with all the other redhat linux-util patches part of 
the .src.rpm

And not knowing the purposes behind many of the applied patches I can't tell 
how far from a working crypto losetup we are; or if or how much still needs 

So I'll have to leave it to the util-linux package maintainers to sort out what 
is still missing and fix it up.

Comment 7 Elliot Lee 2002-12-09 18:59:07 UTC

*** This bug has been marked as a duplicate of 56698 ***

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